Automatic oiling system



Aug. 2, 1932. A. RANDOLPH ET AL AUTOMATIC 01mm SYSTEM 2 Sheets-Sheet 1 Original Filed July 29, 1929 Bnventors w 4m 6.3m Q9" BMW 9 M *2? (Ittomegs 3 A. RANDOLPH ET AL 1,369,776

AUTOMATFIIC OILING SYSTEM Original Filed July 29, 1929 2 hee s-Sheet 2 3nnentors oil pump shown, which Patented Aug. 2, 1932 UNITED STATES PATENT OFFICE;

ALFRED RANDOLPH AND nnwni s. Dawson, or SALEM, OHIO, AssiGnoRs'ro, DEMING- COMPANY, or SALEM, OHIO, A conronnrron or onro AUTOMATIC OILING sYsrnM Original application filed Tuly 29, 1929,. Serial No. 381,708. Divided and this application filed May 29,

. 1930; Serial Our copending application No. 381,708, filed July 29th, 1929, of which this is a division, shows an automatic oiling system suit-. able for power heads of deep well pumps. This system, by a rotary gear pump of 1pcculiar character, carries the oil to a region near the top of the machine where it is dis-, charged into a reservoir from which it is fed by gravity to' suitable points. Our parent application is concerned with the oil pump and the forcing of the oil by pressure by and at the pump. The present invention on .the other hand relates to the distribution of the oil to the connecting rod and cross head. Simplicity of construction and certainty of operation are features of our method of distribution, and the arrangements by which we eifect this will become apparent from the following description taken in connection with the drawings, which show a preferred form of construction. r

In the drawings, Fig. 1 is an end View partially in cross-section showing our oiling system' as applied to a power pump working head; Fig. 2 is a cross sectional elevation taken substantially along the line 22 of Fig.1; Fig. 3'is a cross sectional detail taken along the line 33 of Fig. 1; Fig. 4 is a cross sectional detail taken along the line 44 of Fig. 2; and Fig. 5 is an enlarged cross section taken along the line 5-5 of Fig. 3.

1 We will first describe the characteristics of the power working head, to which our lubricating distribution is applied; then the means for distributing the oil under pressure to the connecting rod and cross head, which constitutes the subject matter of this application, and will then describe briefly theparticular is claimed in our parent application. I In Figs. 1 and 2 of the drawings, we show our preferred form'of working head, a brief description of which follows: The reference numeral 10 indicates 'a drive shaft mounted in bearings-12 and 14 carried by the sump member 15 of the casing 16. The shaft 10 carries a pinion 18 rigidly mounted thereon and meshing with a crank gear 20. The crank pin 22 is supported by the gear 20 and a crank throw 24 which are mounted on stud bearings 26'and 28 respectively, extending through suitable openings formed in the sump member 15. Aconnecting rod' 30 is operated by the crank pin 22 and at-its upper end, the connecting rod is provided with a wrist. pin 32 which extends through and is rigidly mounted in a suitable opening in the cross'head 34. The cross head'is mounted on guides 36 carried by the casing 16 and is provided with a pinv3'8 to which the pump vrod 40 may be secured'in any suitable manner. 1

The oil 17 in the sump member 15, in the form shown, is carried up by the gear 20 and forced by the pinion 18 coacting therewith in the manner'hereinafter described," intothe pipe 85 which carries" it'toa region near the top of thepower head where it is discharged into a reservoir 47 in the upper end ofthe connecting rod. As the cross head 34 and the connecting rod reciprocate the cup 45 will be filled by oil flowing from the tube 35; A duct.47 leads from the cup to the surface of the wrist pin 32. As shown in Fig. 4, an oil duct 49 leads from the cup to'the plane surface 42 of the connecting rod, which contacts with another plane surface 44 on the cross he ad. The duct 51 in the cross head has an opening adjacent theopening of :theduct 49. These openings are large enough to allow oil to flow from the duct 49 into the duct 51 at the greatest angular displacement of the connecting rod. -At rightanglesto the duct 51 there is an oil passage 53 which serves to convey oil to the cross head guides 36. Any excess amount of oil may drip back into the sump and be recirculated.

When the device is in operation the rotation of the gear 20 carries oil from the sump 15 up to the point where the gear meshes with the pinion I 18. Some of the oil is forced through the openings 25 or 27 and into the tube 35 which conveys itto the upper part of the machine. From the tube 35 it flows into the oilcup 45 which supplies-oil t0- the wrist pin hearings and cross head guides. Any overflow from the cup 45 flows down the connecting rod 30 and assists in lubricating the crank pin 22; and excess oil supplied to anyof the bearings may flow back into the sump so that the cycle of operation will be continuous.

We will now describethe pump shown particularly in Figs. 3 and 5, which we have found to be satisfactory means for forcing the oil up the pipe 35.

As the teeth of the driven gearv 2O lift from the sump more oil than there is room for, when the pinion teeth and gear teeth mesh, some of "the oil will be forced laterally from between such meshing teeth. .A part of the oil may escape in a direction opposite to the direction of rotation of the gears, but

not all, because as each pinion tooth comes into contact with the corresponding gear teeth, escape in that direction is cut off and substantially .all of the remainder of the oil will be forced under pressure from between the contacting teeth in a direction parallel with the teeth faces, that is, in a direction parallel with the axes of the gears.

In the end of the bearing 12 which abutsa face of the pinion 18 as at23, we have provided openings25 .and'27 which .lie in theline of contact of the gear teeth, as shown in Fig. 5,.and which may receiveoi'lforced from between the teeth. Ball check valves 29 and 31 maybe placed in the ducts leading to these openings, which communicate with the duct 33 which may be partly within the bearing and partly within the casing 15, and to which the tube 35 isconnected.

A tapered oilgroove 37 in the bearing 12 opens adj acentthe pinion and admits oil to the bearing. A suitable overflow passage 39 is provided which permits excess oil to flow back into the sump. In order to lubricate the bearing 14 asleeve 41 may be loosely mounted on the shaft 10, extending from the pinion 18 to the bearing 14. Some of the oil forced from between the gear teeth will be carried along the inside of the sleeve to the tapered oil groove 43 and the excess may flow back to the sump throughth'e passage 45.

Satisfactory operation of our oil pump regardless of the direction of rotation of the goals is effected by providing two openings adjacent the faces of the gears, one on each side of the point of tangency 13 of the pitch circles of the gears. As shown in Fig. 5, where two of the teeth 19 of the pinion18 are broken away, the opening 25 is below the point oftangencyand the opening 27 isabove. Assuming that the gears are rotating in the direction shown by the arrow on the pinion, the teeth will be coming together below the point of tangency and the oil between teeth 21a and 216 will be forced into the opening 25. At the same time the teeth above the point of tangency will be moving apart and the check valve 31 -(-see Fig. 3) will prevent oil from flowing back through the opening 22 into the space between teeth 21?) and 21a. When the gears are rotating in the opposite direction the operations will be :reversed,oil

will be forced into opening 27, and the valve 29 willprevent oil from flowing back through opening 25.

Describing the operation of the entire machine shown in the drawings,-the rotation of the-gear 20 carries oil from the sump 15 up to the point where the gear meshes with the pinion 18. Then the excess oil is forced from the gear, and that part of the excess which flows out in a direction parallel to the teeth faces is distributed to other parts of the machine which require lubrication. A portion of the oil flows into the groove 37 and lubrica-tes the bearing 12. Another portion flows inside the sleeve 41 to lubricate the bearing 14. Some of the oil is forced through the openings 25 or.27 and into the tube 35 which conveys .it to theupper part of the machine. From the tube 35 it fiows into the oil cup 45 which supplies oil to the wrist pin bearings and cross head guides. Any overflow from the cup 45 flows down the connecting rod 30 and .assists :in lubricating the crank .pin 22; and excess oil supplied toany of the bearings may flow back into thesump, so that :the cycle of operation will be continuous.

We claim: p

1. In an oiling system for a power'head having a connecting rod and a cross head, which have mutual rubbing surfaces and a cross head guide, the combination of an oil cup on the connecting rod, a passageway through said rubbing surfaces for :distributing oil from the oil cup to the cross head guide.

2. The combination of a connecting rod, a cross head, a rigid cross head pin, and a pair of cross head guides, the connecting rodhaving a head which embraces the cross head pin and oscillates thereon and which has :aflat side bearing against a flat face .on the cross head, an oil cup in the connecting rod head, a duct for distributing oil from the oil cup to the cross head pin, a duct from the oil cup through the side of the connecting rod-head, and a communicating duct in the cross head leading laterally in two directions to the cross head guides.

3. A lubricator for a cross head which adapted to move 'in guides and which has a p connecting rod associated therewith, comprising an Oll cup mounted on the connecting rod, aduct leading downwardly from theoil cup and into the cross head, and a channel signatures;

' ALFRED RANDOLPH. EDWIN S. DAWSON. 

